An appeal has been made for SLOT the return of artwork installed on a wall where Banksy's work recently appeared, after two men were seen taking it away.

Mason Storm's design was removed less than 12 hours after being revealed on the wall in Bristol, previously occupied by Banksy's "Aachoo!!".

It had been due to be auctioned off for children's charity Dexter's Odyssey.

Storm created the seven-foot wide artwork as part of an exhibition at Stowe Gallery in Cheltenham.

Banksy's mural itself was removed and is to be auctioned.

Gallery owner Jamie Marchant said they are not sure what the motivation for taking the artwork is, but asked for those who took it to "do the right thing" and return it.

"We don't know if it's been done maliciously for profit or whether they thought it was a free art drop. We've put out the word to the art collecting world for it to be returned

"It was put there for the people and would have stayed there for about a year before being auctioned off," he said.

The artwork had been "hidden" in Bristol and clues were given to encourage people to find it as a part of a "treasure hunt".